Dhaka-Facts
    - Good to know
    D401 Onu Firmware

    Our city map of Dhaka (Bangladesh) shows 29,650 km of streets and paths. If you wanted to walk them all, assuming you walked four kilometers an hour, eight hours a day, it would take you 927 days. And, when you need to get home there are 801 bus and tram stops, and subway and railway stations in Dhaka.

    With a total area of 6 square kilometers, public green spaces and parks make up 0.029% of Dhaka’s total area, 20,413 square kilometers. That means each of Dhaka’s 21,741,000 residents has an average of 0.3 square meters.

    When people in Dhaka want to go out, they are spoilt for choice; our map shows more than 115 cafés, restaurants, bars, ice-cream parlors, beer gardens, cinemas, nightclubs and theatres. The city also boasts more than 252 sights and monuments, and far more than 9,979 retailers. Feeling tired? Our map shows more than 395 hotels and guest houses, where you can rest.




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    D401 Onu Firmware May 2026

    If you manage a fiber network using D401 ONUs (Optical Network Units), you already know they are workhorses for GPON or EPON deployments. But like any networking hardware, firmware is the soul of the device. Running outdated or corrupted firmware on a D401 can lead to random reboots, slow throughput, or complete OLT registration failures.

    # From ONU CLI (Telnet/SSH) tftp -g -r D401_GPON_V3.0.bin -l /tmp/fw.bin 192.168.1.100 upgrade /tmp/fw.bin boot Replace IP with your TFTP server address.

    Have you run into a specific D401 firmware issue? Mention your hardware revision and current symptoms in the comments—chances are someone in the community has solved it already. Disclaimer: Firmware updates carry inherent risk. The author and site assume no liability for bricked devices. Always follow your ISP’s recommended procedures.